package com.cucn.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.cucn.eduservice.entity.EduSubject;
import com.cucn.eduservice.entity.excel.SubjectData;
import com.cucn.eduservice.service.EduSubjectService;
import com.cucn.servicebase.exceptionhandler.GuliException;

/**
 * 读取SubjectExcel文件的监听器
 *
 * @author KouChaoJie
 * @since: 2021/9/28 22:27
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {
    /**
     * EduSubjectService,方便监听器进行数据库操作
     */
    public EduSubjectService subjectService;

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    public SubjectExcelListener() {

    }

    /**
     * 一行一行读取excel内容,添加进数据库
     *
     * @param subjectData Subject与Excel对应关系实体类
     */
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }

        //一行一行读取,每次读取有两个值,第一个值一级分类,第二个值二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectData.getOneSubjectName(), subjectService);
        if (existOneSubject == null) {
            //没有相同一级分类,进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }

        //得到一级分类的id值
        String pid = existOneSubject.getId();
        //判断二级分类是否重复,添加操作
        EduSubject existTwoSubject = this.existTwoSubject(subjectData.getTwoSubjectName(), subjectService, pid);
        if (existTwoSubject == null) {
            //没有相同一级分类,进行添加
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(existTwoSubject);
        }
    }

    /**
     * 判断一级分类不能重复添加
     *
     * @param name           一级分类课程的名称
     * @param subjectService EduSubjectService对象,用来调用数据库操作
     */
    private EduSubject existOneSubject(String name, EduSubjectService subjectService) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", "0");
        return subjectService.getOne(wrapper);
    }

    /**
     * 判断二级分类不能重复添加
     *
     * @param name           一级分类课程的名称
     * @param subjectService EduSubjectService对象,用来调用数据库操作
     * @param pid            父课程的id
     */
    private EduSubject existTwoSubject(String name, EduSubjectService subjectService, String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        return subjectService.getOne(wrapper);
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
